A cool airmass is in place over much of the Interior Alaska this Halloween morning. Over a small portion of the western Interior, skies cleared overnight, allowing temperatures to fall to the lowest levels of the early inter season. Here is the NOAA-19 Polar Orbiter infrared satellite photo from about 630am Monday. The clear skies in portions of the Middle Yukon, Koyukuk and Kobuk valleys stand out in this scale as the bright white colors and hints of the dendritic pattern that shows the cold air pooled in valley. Farther east, warmer (darker) and more uniform areas show a nearly continuous stratocumulus cloud cover. Though 10am, low temperatures include 18 below at Huslia, 17 below at the Selawik River RAWS (well upriver of the village of Selawik) and 11 below at Kaltag.